Transcript Introduction to the UML

Introduction to
UML
 Visual modeling
 Models and its importance
 History of the UML
 Basic UML concepts
What is Visual Modeling?
Visual modeling is a way of thinking
about problems using models organized
around real-world ideas.
What is a Model?
A Model is an abstractions (or
representation) of a complex problem
or structure by filtering out
nonessential details.
Models help us
 organize,
 visualize,
 understand, and
 create complex things.
Models are useful for ...
 Understanding the problems
 Communicating with those involved in the
project (customer, domain expert, analyst,
designers, etc.)
 Modeling enterprises
 Preparing documentation
 Designing programs and databases
Tools for describing models
Textual description
Data
Formulas
Diagrams
Good Models
 Have the right amount of details &
structure
 Represent what’s important in the system
 Model complex systems
 Include different stakeholders’ perspectives
 Represent functional & non-functional
requirements
 Do not include any premature decision
Unified Modeling Language
(UML 1997)
 What? UML is a standard graphical language for
visualizing, specifying, constructing, and
documenting the artifacts of an object-oriented
system under development.
 How? By using icons, 2D symbols, Paths, and
strings:
 Every graphical shape has a certain meaning
 A model could consists of many diagrams.
 Why? Because it’s commonly used in industry and
it’s becoming a standard.
UML Diagrams
 Use case diagram
 Sequence diagram
 Collaboration diagram
 Statechart diagram
 Class diagram
 Object diagram
 Component diagram
 Deployment diagram
 Activity diagram
Benefits of Diagrams
Diagrams are good for
 Communicating ideas
 Generating new ideas
 Testing ideas & making predications
 Understanding structures & relationships
General Rules of Diagrams
 Simplicity of representation: show only
what needs to be shown
 Internal consistency ( and within a set of
diagrams).
 Completeness: show all what needs to be
shown
 Hierarchical representation: break the
system down into layers & show more
details at the lower levels.
UML Concepts: Packages
 A package is a general-purpose mechanism
for organizing elements into groups.
 Packages could also be used to present
different views of system’s architecture.
 Well-structured packages are loosely
coupled and very cohesive.
 In the UML, a package is represented as a
tapped folder.
UML Concepts: Notes
 A note is a graphical symbol for rendering
constraints or comments attached to an
element or a collection of elements.
 Notes have no semantic impact.
 Notes may be attached to one or more
element using dependencies.
 In the UML, a note is represented as a
rectangle with a dog-eared corner.
Use Case diagram
Class Diagrams
UML Resources
 Click here